exam Maths Puzzle Numerical Ability

Useing the PEMEDS expesssion, (Please, excuse, my dear, aunt sally)

Simplify

1. 2+3*5^2-7

2. 6+3[(12/4)+5]

3. (4/2)+4(5-2)^2

4. -8-81/9*2^2+7

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exam Other Question

Simplify: y(squared)+y-20/y(squared)-2y-8. Assume that the denominator is not equal to 0. What would the coordinates be when solving this system of linear inequalities by graphing?
x - 3y > 6
3x + 2y > 12